231132320 has 96 divisors (see below), whose sum is σ = 571309200. Its totient is φ = 88252416.

The previous prime is 231132299. The next prime is 231132337. The reversal of 231132320 is 23231132.

It can be written as a sum of positive squares in 8 ways, for example, as 170354704 + 60777616 = 13052^2 + 7796^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 505532 + ... + 505988.

Almost surely, 2^231132320 is an apocalyptic number.

231132320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231132320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (285654600).

231132320 is an abundant number, since it is smaller than the sum of its proper divisors (340176880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231132320 is a wasteful number, since it uses less digits than its factorization.

231132320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610 (or 602 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 231132320 is about 15203.0365387971. The cubic root of 231132320 is about 613.6963771674.

Adding to 231132320 its reverse (23231132), we get a palindrome (254363452).

The spelling of 231132320 in words is "two hundred thirty-one million, one hundred thirty-two thousand, three hundred twenty".